Electric guitars can have solid, semi-hollow, or hollow bodies; solid bodies produce little sound without amplification. Electromagnetic pickups convert the vibration of the steel strings into signals, which are fed to an amplifier through a patch cable or radio transmitter. The sound is frequently modified by other electronic devices (effects units) or the natural distortion of valves (vacuum tubes) or the pre-amp in the amplifier.
Here’s a video of Ralph Ciociano, maker of the world’s largest handmade single player guitar plays his Giant electric guitar near Times Square in New York City. Check it out!